Chisel-spike



Jan. 25, 1966 SHELTON 3,231,026

CHISEL-SPIKE Filed June 22, 1964 FIG. 3

FIG. 5

DOTHAN L. SHELTON INVENTOR.

United States Patent 3,231,026 CHISEL-SPIKE Dothan L. Shelton, 2100 S. Polk, Amarillo, Tex. Filed June 22, 1964, Ser. No. 377,033 3 Claims. (Cl. 172-713) This chisel spike is similar to the point disclosed in my co-pending application for United States Letters Patent, Serial No. 243,938; now Patent No. 3,148,738.

This invention relates to earth tillage tools and more particularly to a chisel-spike designed for deep cultivation or chiseling.

An object of this invention is to provide a self-sharpening chisel-spike.

Another object is to provide a self-sharpening chiselspike so designed that its wearing characteristics cause it to retain a triangular shape in cross section as it wears thus maintaining the sharp point for penetration of the earth.

Another object is to provide a chisel-spike having a body in triangular cross section which has different metallurgical characteristics at the three edges.

A further object is to provide a chisel-spike which has raised surfaces thereon which make it easier to apply hard surfacing material thereto.

A further object is to provide such a chisel-spike adaptable to forging, and of rugged construction.

Still further objects are to achieve the above with a device that is sturdy, compact, durable, simple, versatile, and reliable, yet inexpensive and easy to manufacture and operate.

The specific nature of the invention as well as other objects, and advantages thereof will clearly appear from the following description and from the accompanying drawing, the different views of which are not to the same scale, in which:

FIG. 1 is a side elevation of a chisel-spike according to this invention.

FIG. 2 is a developed front view of the tillage point taken on line 2-2 of FIG. 1.

FIG. 3 is a developed back view taken on line 3-3 of FIG. 1.

FIG. 4 is a cross-sectional view taken on line 44 of FIG. 1.

FIG. 5 is a cross-sectional view taken on line 5--5 of FIG. 2.

Referring to FIG. 1, it may be seen that the chiselspike is arcuate in shape so that it is adapted to be bolted to curved shanks as for example seen in my copending application noted above. Center portion of the chiselspike is rectangular in cross section as may be seen in FIG. 4. The center portion 10 has two holes 12 therethrough for plow bolts as is customary in the art.

Each end of the rectangular center portion 10 fairs into a blade section 14 which is basically triangular in cross section and which forms the tillage blade. Referring particularly to FIG. 5, the triangular cross sectional blade 14 has two working faces 18 which form sides of the triangle. Back face 20 forms the base of the triangular cross section and is a segment of a cylinder. Lip 22 runs along the front spine of the chisel-spike at the junction of the two working faces 18. A lip 24 runs along each of the edges of the plow at the junction of the working faces 13 and the back face 20. Thus, a lip is formed at each of the three edges of the blade 14. Depression 26 is formed in the back face 20 of the tool (FIGS. 3 and 5).

3,231,026 Patented Jan. 25', 1966 "ice A study and analysis of this tool will reveal that I have provided a particularly advantageous chisel-spike to be forged. The depression 26 results in a chisel-spike that does not have widely varying cross sections. Without the depression 26 the cross section wherein FIG. 5 is taken would contain much more metal than the cross section through the middle (at FIG. 4) or through the ends. By providing the depression 26, a uniform cross section is provided. Also, when the chisel-spike is forged, the flow of metal to the lips 22 and 24 causes an additional working of the metal. This additional forging or working of the metal gives the metal improved and advantageous qualities for tillage. During normal usage and wear the chisel-spike will maintain its triangular shape and form. The increased working forms natural hard abrasion-resistant areas where desired.

The protrusion of the lips 22 and 24 from the bulk of the rest of the metal makes them more susceptible to hardening by heat treatment or other metallurgical procedures.

Also these lips 22 and 24 form a natural repository for laying hard surfacing material such as any of the numerous metallic carbides applied by arc welding which are readily and commercially available. Alternatively, the chisel-spike may be chrome plated.

Although the chisel-spike is particularly designed to be forged, it could be cast and the hard plating applied as discussed above.

Therefore, it may be seen that I have provided a chiselspike with a triangular blade with a hard surfaced area at each of the three corners so as to control the wear of the blade so that the chisel-spike maintains its shape, sharpness, and penetrating abilities.

It will be apparent that the embodiment shown is only exemplary and that various modifications can be made in construction, materials, and arrangement within the scope of the invention as defined in the appended claims.

I claim as my invention:

1. A metal chisel-spike for tillage comprising:

(a) a back face which is a segment of a cylinder,

(b) a center portion which is rectangular in cross section,

(c) a blade portion on each side of the center portion which is triangular in cross section,

(d) the back face forming one of the sides of the triangle, and

(e) a lip extending along each edge of each blade portion.

2. The invention as defined in claim 1 wherein (f) the metal of the lips is harder and more wear resistant than the metal of the remainder of the blade.

3. A metal chisel-spike for tillage adapted to be formed by forging comprising:

(a) a center portion which is rectangular in cross section,

(b) a blade portion on each side of the center portion which is substantially triangular in cross section except for a depression in the back face of each blade portion,

(c) therefore the cross sectional area of the chiselspike being substantially the same from end to end,

(d) a lip extending along the blade at each of the corners of the triangle,

(e) the metal of the lip being harder and more wear resistant than the metal of the remainder of the blade,

(f) said point being arcuate so that itis adapted to be References Cited by the Applicant attached to an arcuate shank, and

(g) Bolt holes through the center portion thereof. UNITED STATES PATENTS 1,108,600 8/1914 McCulley et a1. References Cited by the Examiner 5 UNITED STATES PATENTS ABRAIIAM G. STONE, Primary Examiner.

1,927,818 9/1933 Brodersen 172- 713 X GRAHAM CRAVER, Examiner- 3,148,738 9/1964 Shelton 172699 X 

1. A METAL CHISEL-SPIKE FOR TILLAGE COMPRISING: (A) A BACK FACE WHICH IS A SEGMENT O A CYLINDER, (B) A CENTER PORTION WHICH IS RECTANGULAR IN CROSS SECTION, (C) A BLADE PORTION ON EACH SIDE OF THE CENTER PORTION WHICH IS TRIANGULAR IN CROSS SECTION, (D) THE BACK FACE FORMING ONE OF THE SIDES OF THE TRIANGLE, AND (E) A LIP EXTENDING ALONG EACH EDGE OF EACH BLADE PORTION. 